Jev vs Claude Fable 5.1: cost per decision
Fable sits at the top of this comparison set. The gap against Jev is the largest here, which makes it the honest upper bound rather than the number to quote.
| Scenario | Jev 1.13 | Claude Fable 5.1 | Ratio |
|---|---|---|---|
Light 10k items/day, 300-token state, 2 questions | $5.29 | $1,710 | 323x |
Production 100k items/day, 500-token state, 4 questions | $93.24 | $29,700 | 319x |
High volume 2M items/day, 300-token state, 1 question | $856.80 | $234,000 | 273x |
Monthly, 30 days. Both sides answer all questions for an item in a single call. Claude Fable 5.1 additionally pays for its output tokens at $50/M; Jev 1.13 has no output charge. List prices at standard tier, excluding caching and batch discounts.
Where Claude Fable 5.1 still wins
Fable is built for long-form generation and nuance. If the output is prose a person will read, the comparison is not price — Jev has no output to compare.
The honest caveat
This compares price, not accuracy. A model that is 100x cheaper and wrong 5% more often can easily be the more expensive choice once you price the mistakes. Jev returns a calibrated probability with every answer, so the practical move is to route the confident cases automatically and send the rest to Claude Fable 5.1 or a human — which makes this a routing decision rather than a replacement decision.